Amazon misspells a word.

...What's actually going on here is probably something like this:

Google has a policy that, when sorting search results for relevance, pornographic media is never relevant if it is possible that the intent of the search is something non-pornographic. For any other subject, the standard is most likely: it's most likely that the person searching for "rebook shoes" is in fact looking for Reebok shoes, not for a synopsis of the picture book Rebook, The Elf Who Returned A Library Book On Time, which happens to mention that the title character wears pointy shoes. So the Reebok homepage is the first hit.

If Google treated sneakers the way it treats porn, though, Reebok's homepage wouldn't show up at all, because it's possible that someone wanted that elf book. Words and phrases that have both sexual and nonsexual meanings - even if the sexual one is more commonly-used - don't return porn when you google them. This is because parents looking for information about spanking are going to be more unnerved by the inclusion of porn in their search results than are porn-seekers about earnest interviews with child psychologists.

Google employs hordes of actual human beings to decide whether a query is actively looking for porn. Yes, that's right: it is possible that your "benedict cumberbatch holmes/basil rathbone holmes h/c handjob" query has been evaluated for pornbiguity by a bored part-timer. (It didn't happen in real-time, if that makes you feel better.) This part-timer looks at the one-word query "spanking," goes "well, this could be a new parent or something," and marks it as a No-Porn query. The same part-timer, unable to imagine a second and innocent meaning for the phrase "spanking adult xxx [celebrity name]," will mark it as Porn-Okay.

(S/he also researched the term "h/c" to make sure it didn't modify "handjob" in a way that altered the meaning of the term. Because Google's mission is to organize all the world's information, goddamn it.)

( Cut for length. )